import turtle
window = turtle.Screen()
babbage = turtle.Turtle()
babbage.color("green","black")
babbage.left(90)
babbage.forward(100)
babbage.right(90)
babbage.color("black","yellow")
babbage.begin_fill()
babbage.circle(10)
babbage.end_fill()
for i in range(1,24):
    if babbage.color() == ("red","black"):
        babbage.color("orange","black")
    elif babbage.color() == ("orange","black"):
        babbage.color("green","black")
    else:
        babbage.color("red","black")

    babbage.left(15)
    babbage.forward(50)
    babbage.left(157)
    babbage.forward(50)
babbage.hideturtle()
window.exitonclick()
